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If z - 4z > 5 then which of the following is always true

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Intern
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If z - 4z > 5 then which of the following is always true [#permalink]

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New post 15 Aug 2008, 08:40
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If z² - 4z > 5 then which of the following is always true

A) z > -5
B) z < 5
C) z > -1
D) z < 1
E) z < -1

Please explain
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Rocky

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Re: Another inequality [#permalink]

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New post 15 Aug 2008, 08:49
tekno9000 wrote:
If z² - 4z > 5 then which of the following is always true

A) z > -5
B) z < 5
C) z > -1
D) z < 1
E) z < -1

Please explain


Q : z^2 - 4z - 5 > 0
z^2 - 5z + z - 5 > 0
z(z-5) + 1(z-5) > 0
(z-5)(z+1) > 0

either both are +ve
z > 5
OR
both are -ve
z < -1

Option E
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Re: Another inequality [#permalink]

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New post 15 Aug 2008, 09:08
E, same explanation as above
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Re: Another inequality [#permalink]

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New post 15 Aug 2008, 10:54
tekno9000 wrote:
If z² - 4z > 5 then which of the following is always true

A) z > -5
B) z < 5
C) z > -1
D) z < 1
E) z < -1

Please explain


Is that Z^Z, or Z^2?
Intern
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Re: Another inequality [#permalink]

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New post 18 Aug 2008, 01:19
why not C? z>-1?
Re: Another inequality   [#permalink] 18 Aug 2008, 01:19
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If z - 4z > 5 then which of the following is always true

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